L and M are two points with position vec...

L and M are two points with position vectors `2vec(a)-vec(b)andvec(a)+2vec(b)`, respectively. The position vector of the pont N which divides the line segment LM in the ratio 2:1 externally is

A

`3barb`

B

`4barb`

C

`5barb`

D

`3bara+4barb`

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The correct Answer is:

C

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